Lincoln Electric LN-25 Service Manual page 48

F-11
GAS SOLENOID VALVE AND SOLENOID PC BOARD TEST (continued)
FIGURE F.4 Ð PC BOARD FOR K430-1 GAS SOLENOID KIT .
FIGURE F.5 Ð PC BOARD FOR K430 GAS SOLENOID KIT .
M15202
M15202
606
624A
512
2. Check for the presence of the DC
voltage applied from lead 624A(+) to
lead 621(-). See Figure F .4 and
Figure F .5.
3. Check for the presence of 12 VDC
from lead 512(+) to lead 621(-).
4. Check for the presence of 10 VDC
from lead 606(+) to lead 621(-). When
the LN-25 trigger circuit is activated,
the voltage should drop to about
1 VDC.
5. If the above voltage readings are
good and the solenoid valve is
TROUBLESHOOTING AND REPAIR
512
512
624A
624A
621
621
621
functional, the solenoid PC board
may be faulty .
6. If the above voltage checks are not
correct, the control board, contactor
board (if used), remote control board
(if used) and/or wiring harness may
be faulty . Refer to the wiring diagrams
in the Electrical Diagrams Section.
The appropriate jumper plugs may be
used to isolate and check suspect
contactor or remote control boards.
LN-25
F-11
621
J11
J11